USTTERNAL BEOWNUSTG OF YELLOW NEWTOWN APPLE. 



15 



Plat 3, the phosphorus plat, received 20 pounds of superphosphate 

 per tree on April 3, 1918. In 1919 10 pounds of superphosphate 

 and 10 pounds of steamed bone meal were added. In 1920 6 pounds 

 of steamed bone meal were added for each tree. 



All fertilizers were applied in the spring before cultivation was 

 completed, and were thoroughly worked into the soil. 



GROSS EFFECT OF FEKTILIZEKS. 



During the first two seasons little influence of the fertilizer could 

 be detected in any of the plats. During 1919, however, it was 

 evident that the foliage of the trees of the nitrogen plat was better 

 than that of the surrounding trees, the leaves being larger and 

 greener in appearance. In 1920, a year of very short crops for the 

 orchard as a whole, trees in this plat produced more nearly a full 

 crop. 



It has been impossible to determine any influence of the phos- 

 phorus fertilizer in plat 3. Foliage, crop, and fruit were about as 

 in the untreated trees in the orchard. 



Trees in the manure plat were no better in appearance than 

 surrounding untreated trees. The foliage was very poor, and the 

 set of fruit on the trees in the years when the orchard as a whole 

 bore a light crop was even below that of the surrounding trees. 



INFLUENCE OF FERTILIZERS ON THE INTERNAL BROWNING OF THE FKUIT. 



Table 5 gives the average percentages of browning in fruit from 

 each fertilizer plat during the seasons of 1918-19 and 1920-21, during 

 which browning has occurred to an appreciable extent, since the 

 treatment was initiated. 



Table 5. 



-Summary of the influence of fertilizers upon the internal iroivning 

 of Yelloio Netctown apples in ttco different seasons. 





Num- 

 ber of 

 trees. 



Num- 

 ber of 

 apples 

 cut. 



Comparison of results (per cent). 



Season, plat, and treatment. 



Sound. 



Tissue browning. 



Core browning. 





Trace. 



Me- 

 dium. 



Bad. 



Trace. 



Me- 

 dium. 



Bad. 



Season of 1918-19; storage 

 temperature, 36° F.: 

 Plai 1, nitrogen 



15 

 15 

 15 

 9 



15 

 15 

 15 

 9 



982 



1,004 



945 



817 



1,560 



1,571 



1,543 



967 



48.7 



n.4 



27.4 

 23.9 



18.4 

 8.7 

 9.0 

 7.1 



10.2 



24.4 



8.0 



15.2 



24.4 

 25.1 

 28.0 

 31.9 



10.2 

 16.6 

 3.1 

 8.3 



16.3 

 14.1 

 22.9 

 13.5 



10.7 

 8.3 

 L9 

 5.9 



17.8 

 25.1 

 13.9 

 10.4 



17.6 

 16.9 

 19.2 

 16.5 



38.2 

 29.4 

 33.4 

 32.0 



13.2 

 29.9 

 22.5 

 25.1 



2L0 

 27.0 

 37.5 

 34.1 



9.2 



Plat. 2, mfVTHire 



33.5 



Plat 3, phosphorus 



Plat 4 check 



24.7 

 26.3 



Season of 1920-21; storage 

 temperature, 31° to 32° F.: 



18.6 



Plat 2, manure 



30.9 



Plat 3, phosphorus 



Plat 4, check 



20.2 

 26.0 







